Can someone explain the russian revolution of 1917 and how it effected world war 1

In 1914, World War I began and Russia was at war with Germany. A huge Russian army was formed by forcing working class and peasant men to join. Although the Russian army had great numbers, the soldiers were not equipped or trained to fight. Many of them were sent into battle without shoes, food, and even weapons. Over the next three years, nearly 2 million Russian soldiers were killed in battle and nearly another 5 million were wounded. The Russian people blamed the Tsar for entering the war and getting so many of their young men killed.

Explanation:

the correct answer is b, "fertility rates are increasing, so populations will grow more quickly in the future."